[−][src]Trait vrp_core::algorithms::nsga2::Objective
An objective defines a total ordering relation and a distance metric on a set of
solutions
. Given any two solutions, an objective answers the following two questions:
- "which solution is the better one" (total order)
- "how similar are the two solutions" (distance metric)
Associated Types
type Solution
The solution value type that we define the objective on.
Required methods
fn total_order(&self, a: &Self::Solution, b: &Self::Solution) -> Ordering
An objective defines a total ordering between any two solution values.
This answers the question, is solution a
better, equal or worse than solution b
,
according to the objective.
fn distance(&self, a: &Self::Solution, b: &Self::Solution) -> f64
An objective defines a distance metric between any two solution values.
The distance metric answer the question, how similar the solutions a
and b
are,
according to the objective. A zero value would mean, that both solutions are in fact the same,
according to the objective. Larger magnitudes would mean "less similar".
fn fitness(&self, solution: &Self::Solution) -> f64
An objective fitness value for given solution
.